Born into a French family resident in Rome, the artist was also called Gaspard Poussin as a result of his relationship with Nicolas Poussin, his sister’s husband. The influence of his brother-in-law’s work appears to be a constant factor in his own production, consisting primarily of views of the countryside around Rome and imaginary landscapes with some references to models of a northern character, as in his storm scenes. Contact with Claude Lorrain led to greater attention to the handling of light.
Dughet was also active outside Rome, in Florence around 1640 and then in Naples. Much in demand with aristocratic clients, he worked in various residences of the Pamphilij family from 1650 on and subsequently for the Colonna and Borghese families. He became a member of the Academy of San Luca in Rome in 1657.